Flimflam is talk that is empty, false, or silly — a shiny story that does not hold together when you look. It can be ideas that sound clever and then fall apart, or fast words meant to impress you. People also use it for a small cheat: getting money with a show of talk rather than with truth. The tone is informal, a bit like a performance. “That’s just flimflam” is close to “that’s nonsense,” but flimflam adds a smell of waving hands. Though actually, it is not a courtroom word; there you would say lies or fraud. You will hear it more in American English than in careful school English. It is a playful doubled word, the kind English likes for tricks and fuss. I will not pretend I know the first speaker; beyond that doubling, the birth of the word is not a story I can stand behind.

鬼話、唬爛、騙人的說法（口語；帶一點「說得天花亂墜」的味道）